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Timestamp:
Feb 24, 2020, 3:35:23 PM (6 years ago)
Author:
eugene
Message:

updates after referee comments

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1 edited

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  • trunk/doc/release.2015/ps1.calibration/calibration.tex

    r41240 r41276  
    2121%% NOTE: 2019 Feb versions of the figures are generated in /data/kukui.1/eugene/cal.paper.20190217
    2222
    23 %\def\picdir{pics}
    24 \def\picdir{.}
     23\def\picdir{pics}
     24%\def\picdir{.}
    2525
    2626% Pick a terse version of the title here;
     
    106106consistent zero points over the entire area surveyed, the \approx
    10710730,000 square degrees north of $\delta = -30$\degrees.  \textadd{Using external
    108 comparisons, we demonstrate that the resulting photometic system is
    109 consistent across the sky to between 7 and 12.4 millimags depending on
     108comparisons, we demonstrate that the resulting photometric system is
     109consistent across the sky to between 7 and 12.4 millimagnitudes depending on
    110110the filter.  For bright stars, the systematic error floor for
    111 individual measurementsis $(\sigma_g, \sigma_r, \sigma_i, \sigma_z,
    112 \sigma_y) = (14, 14, 15, 15, 18)$ millimags.}  The astrometric
     111individual measurements is $(\sigma_g, \sigma_r, \sigma_i, \sigma_z,
     112\sigma_y) = (14, 14, 15, 15, 18)$ millimagnitudes.}  The astrometric
    113113calibration compensates for similar systematic effects so that
    114114positions, proper motions, and parallaxes are reliable as well.  \textadd{The
     
    385385
    386386Coordinates and calibrated magnitudes of stars from the reference
    387 database are loaded by \ippprog{pasastro}.  A model for the positions of
     387database are loaded by \ippprog{psastro}.  A model for the positions of
    388388the 60 chips in the focal plane is used to determine the expected
    389389astrometry for each chip based on the boresite coordinates and
     
    488488  (changes from over time).  The spatial scale on which the
    489489  astrometric deviations due to atmosphere are varying is related to
    490   the isoplanetic patch size.  We note that, in the typical conditions
     490  the isoplanatic patch size.  We note that, in the typical conditions
    491491  at the \PSONE\ site, if the seeing is due to low-lying atmospheric
    492   layers, the isoplanetic patch scale will be at most a few arcminutes
     492  layers, the isoplanatic patch scale will be at most a few arcminutes
    493493  \citep{1988ESOC...30..693B}, and smaller when the seeing comes from
    494494  higher altitudes.}
     
    886886measurements of the same stars from different nights to tie nights
    887887together.  \textadd{This analysis relies on the chemical and
    888   thermodynamic stability of the atmosphere during a photometic night
     888  thermodynamic stability of the atmosphere during a photometric night
    889889  so that the zero point and extinction slope are stable as a result.}
    890890Flat-field corrections are also determined as part of the minimization
     
    916916  SDSS as an external reference, with standard deviations of (8.0,
    917917  7.0, 9.0, 10.7, 12.4) millimags in (\grizy).  Internal comparisons
    918   show the zero-points of indidual exposures to be consistent with the
     918  show the zero-points of individual exposures to be consistent with the
    919919  Ubercal solution with a standard deviation of 5 millimags.  The
    920920  former is an upper limit on the overall system zero-point stability,
     
    23952395rotation curve and set a fixed proper motion.}  If we do not have a
    23962396distance modulus from the Green et al analysis, we assume a value of
    2397 500pc.  \textadd{We find that applying our Galactic rotatation model improves
     2397500pc.  \textadd{We find that applying our Galactic rotation model improves
    23982398the systematic proper motion errors to some extent.  The standard
    23992399deviation of the quasar proper motions (averaged on 12 arcminute
     
    24522452astrometric analysis to provide a measurement which is robust against
    24532453failures.  In addition to the detector effects artifacts which affect
    2454 astrometry, the astrometric measurments may have non-Gaussian outliers
     2454astrometry, the astrometric measurements may have non-Gaussian outliers
    24552455due to the high degree of structure in the astrometric transformations
    24562456introduced by the camera optics and the atmosphere.  We have again
     
    31183118Canada-France Imaging Survey, or CFIS, collaborations) is expected to
    31193119release deep photometry in the {\it ugriz} bands for roughly 5000
    3120 square degrees of the northern hemisphere with agressive photometric
     3120square degrees of the northern hemisphere with aggressive photometric
    31213121precision goals.  This collaboration is in part motivated to support
    31223122the Euclid satellite mission, which requires deep 8-band photometry to
     
    31373137\textadd{Second, cross-comparisons between independent datasets are critical to
    31383138reveal the limitations.  This lesson has appeared several times in our
    3139 intestigations, in the comparison between Pan-STARRS and Gaia above,
     3139investigations, in the comparison between Pan-STARRS and Gaia above,
    31403140between Pan-STARRS and SDSS \citep{2016ApJ...822...66F}, and in the
    31413141comparison between Pan-STARRS and 2MASS \citep{2013ApJS..205...20M}.
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